DE2002572A1 - Ambient air evaporator - Google Patents

Description

PATENT ADVOCATE.

DR. MOLLER-BORE -DR. MANITZ - DR. DEUFEL 1 Π Π O C T

DlPL-ING. FINSTERWALD DIPL-ING. GRÄMKOW L UU L O / L

—- 8MONCHENaZ ₁ ROBERT-KOCH-STR.! -. TELEPHONE22S1W

January 21, 1970 Hl / Sν - A 206?

AIR REDUCTION COMPANY, INCORPORATED 150 East 4-2nd Street, New York, New York 10017, USA

Ambient air vat

The use of various types of ambient air evaporators in the cryogenic industry is known and ambient air evaporators are known which are in the form of cast aluminum bodies in the form of blocks interposed for the passage of a cryogenic fluid to be heated , connected * Another known evaporator is in the form of elongated sections of expanded surface material made from aluminum extrusions. Extruded profiles are generally star-shaped figure formed with a multiplicity W of radially extending ribs and having a central opening through which extends the low temperature fluid. The extruded profile is usually made of the aluminum alloy 6063-TI (Tl) in an elongated piece, which is then cut into the desired lengths. Typically, the extrusions are arranged in a block with four sections on one side and each section is in a row, parallel, or combination with the next

009831/1586

of these (as desired) by means of bent tubing "that is welded to the Hittelöffnungen of extruded aluminum profiles to be connected so that fluid in one end of the extruded profile and through the opening extending through the interior of the extruded profile, and then from the other end can be conveyed through the outlet pipeline. The starting tubular material is connected in rows by welding to an adjacent extrusion and the cryogenic liquid is thereby carried from one section to the next until it has gone through all 16 sections. Such ambient \\\ it evaporators are often used in consumers st at using ion which include a liquid storage tank in which liquefied gas is stored, and a high-pressure liquid spumpe which causes the suction to the liquid storage tank and the exiting Hochdruc ^ liquid leads to the environment alufb evaporator. The vaporizer may take the form of any of the vaporizers described above and also the form of an vaporizer according to the invention, as will be described in more detail below. The gaseous product is led from the evaporator to a consumer point such as a steelworks, an aluminum remelting furnace or possibly into a Gaezylnder fill pipe branch. To Unteretütsung dee Vttratttber tragungsproseasee, a fan positioned to "one, it Dafi ambient air over the evaporator leads · Dme Srfordernis for such fan would of course depend on the desired Verdampfungerate and -vorliegenden climatic conditions.

In the known ambient air evaporator, which for descriptive purposes is described as a star type, it has been found that numerous examples of failures of the critical welds appeared. The failures or damage occur-

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due to the fact that the pipe material that the evaporator sections connects to the ends of the evaporator sections Must be welded to withstand hundreds of kilograms of pressure. In general- " NEN consists of the pipe material connecting the evaporator sections made of bent aluminum tubing and the evaporator sections themselves are made of extruded aluminum manufactured. The welds connecting these two elements must therefore be made with a high degree of experience. be made so that they are completely .fluiddicht are and can withstand a high internal vapor pressure. In a normal consumer station is expected to be a normal

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the pressure of 200 kg / cm- (300 psi) or more is reached in the evaporator. In the most common ambient air evaporator arrangement, 16 sections are used. Therefore, at least 32 welds are required to join and connect the tubing to the extruded sections. As stated above, each and every weld must be carefully made and then carefully examined and hydrotested to be able to withstand the rigors of cryogenic service. The expansion and contraction degree of differently shaped metal parts vary "Thus, the various parts of the ambient air vaporizer pull together in different ways, if the cryogenic liquid, the examples as liquid nitrogen at -195 ⁰ C (-52O ⁰ F) may flows through the tubing and the M extruded sections. This means that the ^v

Welds connecting the different parts, additional Subject to stress. The ambient air evaporator are often used cyclically, and the stresses and stresses to which the welds that connect the parts are subjected can often damage of the welds or * cause the welds to fail. Thus the technique of welding is the

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cuts with the connecting pipe material is an extremely costly manufacturing process and has proven to be a Process identified which provides an unreliable product.

Thus, the known ambient air evaporator, although widely used, has various disadvantageous Structure and construction concepts.

The aim of the invention is to provide a heat exchanger structure and a method and apparatus for manufacturing this structure which overcomes all of the above-mentioned disadvantages of the known ambient air evaporators. The object of the invention is an ambient air evaporator which uses expanded fin surfaces of extruded aluminum coupled with a stainless steel conduit running through the expanded fin section. Another object of the invention is that the extruded aluminum sections are connected to the excavated matter stainless steel without any welding.

Another object of the invention iet the coupling of extruded aluminum profiles with the inner tube material in a manner that different materials can expand and eusammenziehen, without the operation dea evaporator to affect in any way.

Yet another object of the invention is to provide a fin assembly for an ambient air evaporator with an extensive surface.

According to the invention, identical extruded profiles can be locked around a line, the cryogenic liquid can lead to vaporization. Each identical

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extruded section carries a locking device, those with another identical section in such Can be coupled way that the sections are prevented from unlocking.

According to the invention a method is provided, a section with extensive surface or sections to lock a liquid or fluid-carrying line.

Another object of the invention is a method and a Apparatus for locking identical sections of expanded aluminum surface material around an elongated pipe.

According to the invention, a ribbed arrangement is provided for a heat exchanger, which has an extended surface part and an elongated tubular member, the expanded surface portion comprising identical portions of inner

each of which has a cylindrical surface suitable for engaging the tubular member, and each other having radially extending locking members with Locking members can engage on the other of the parts. The invention provides a method and an apparatus for attaching the extended surface portion to the limb.

In accordance with the invention, there is one type of ambient air evaporator provided, which is made of different materials that are joined together without welding. The vaporizer according to the invention is capable of high vapor pressure to withstand and has excellent heat transfer characteristics.

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The invention is illustrated below, for example, with reference to FIG Drawing described; in this shows:

FIG. 1 is a partial perspective view of an ambient air evaporator, the bit of a schematic known consumer station shown is coupled,

FIG. 2 is a perspective view, partly broken away and partly in section, of a known ambient air evaporator section made of extruded aluminum; Jigur 3 is an end view of an extruded profile that is designed according to a preferred embodiment of the invention,

Figure 4 is an end view, partly in cross-section, partly broken away, of a pair of identical ones Extruded profiles with a line according to a preferred embodiment of the invention are locked

Figure 5 is an end view, partly in section; partially broken away, a pair of extruded profiles to be just coupled according to another embodiment of the invention,

Figure 6A is a cross-sectional view of an extruded environment β air vapor he cut it off around a pipe, which can be coupled with this according to another embodiment of the invention,

Figure 6B is an end view, partly in section, partly broken away, another embodiment of the invention,

FIG. 7 is a plan view, partially broken away, of a device with locking of the sections of an ambient air evaporator according to the invention,

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Figure 8 is an elevation, partly broken away, of the device in Pig. 7 »

Figure 9 is an end view, partly in section, partly away; broken, the evaporator he sections and the conduit locked in a first locking operation in a first set of forming rollers, Figure 10 is an end view, partly in section ₄ partly broken away, of a second. set of forming 'rollers which the locking of the extruded aluminum sections on the tubular conduit completed, and. Figure 11 is an end view, partly in section, partly broken away, of another embodiment of the invention. '

In Fig. 1 is an ambient air evaporator bank baw. -Assembly 10 is shown, which is connected to a hi eft temperature storage tank 11 by means of a line 12. A pump 13, which is suitable for pumping a low-temperature liquid, pushes high-pressure low-temperature liquid into the ambient air evaporator arrangement 10. If the storage tank 11 contains liquid nitrogen, for example, the temperature of the nitrogen entering the ambient air evaporator arrangement is approximately -195 ⁰ O (-520 ⁰ F). The cryogenic liquid passes in sequence through the sections of the arrangement 10 * in which the liquid is evaporated and the resulting liquid. Dwapf resigns through the Leituayg. The dispensing pressure of the SiefteMp «rat \ ir-OaBpf« e is normally controlled by a pressure regulator 15, and both ^: the storage tank 11 and the delivery lines 12 and 14 are normally equipped with known pressure relief valves, shut-off valves and coupling connections, T die ^; are not shown. In a typical nitrogen consumption station, the pumping system and the evaporator are able to

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Deliver 5000 SCFH at 210 kg / cm ² (JOOO psi) to the point of consumption. The size of the evaporator 10, the pump 13 and the storage tank 11 will of course depend on the amount of steam that must be delivered to the point of consumption. The drawing in Fig. 1 is not to scale. Those skilled in the art will understand that normally the storage tank is noticeably larger than the evaporator structure. The evaporator assembly is normally enclosed in a framework generally indicated by reference numerals 16 and 1? is specified . In known ambient air evaporators, the fins of the evaporator sections are connected directly to frames 16 and 17 to structurally mount the assembly in the framework. As will be explained in more detail below, the invention provides for the connection of the pipeline system to the frames 16 and 17. This substantially reinforces the overall evaporator assembly 10 due to the fact that the stainless steel tubes are directly connected to the steel housings 16 and 17.

Depending on the desired output power of the urn; Flush air evaporator assembly 10 may thus require the installation of a fan 20 to blow ambient air over the evaporator assembly. Is printed in the air over the evaporator arrangement, an additional output power can reach the evaporator who the.

The details of the storage tank 11, which is normally vacuum-insulated, and the fumpsyeteme 13 are not explained in this description since they do not form part of the invention and in view of the fact that many different types of tanks and pump systems are commercially available.

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2 shows a perspective view of a known ambient air evaporator section which is connected in the known manner to a rough aluminum pipe by a continuous annular weld 28. The known star-type evaporator has eight radially extending ribs 25 which extend from a central annular hub 26 with a hollow interior 27. This structure is usually made from extruded aluminum. The cryogenic liquid, in the first example, runs from conduit 12 into interior space 27, where it is warmed up as it passes through the extruded section. The star configuration provides a large surface area per unit length of section, which results in high heat transfer to the cryogenic liquid. When the pipe material is welded to the extruded material, the weld must be relieved of tension in the known manner by means of a heating process, or extremely thick-walled pipe material must be used. In a similar way, a line comparable to line 12 is connected to the other end of the section and is welded in the same way as explained above in connection with weld 28. Such a weld must be made at each end of the evaporator section. If the evaporator assembly includes 16 evaporator sections, at least 32 welds must be made to connect the sections to suitable piping. For a high Dampfdruckwideretand the Waodatärke of the aluminum tube materials must be considerably thicker than the wall thickness of tube material of stainless steel dae, is dimensioned for a comparable Druckwideretand ·

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In Fig. 3 is shown a band view of a portion of an ambient air evaporator section constructed in accordance with a preferred embodiment of the invention. The part

35 Is formed from extruded aluminum and is normally used in Staaflard lengths of 180 cm (6 feet). The part comprises a pair of radially extending ribs 36 and 37 'which are connected to a central hub 38 by means of rib members 39 and 40, respectively. The rib parts 39 and 40 have a greater thickness than cDe rib parts 36 and 37, since they support ribs 36 and 37 and ribs 42 and 43. The added strength also provides more favorable heat transfer characteristics.

The ribs 42 and 43 are as an extension of the ribs

36 and 37 have been designed because of this, dsB the part of Hub 38, which would normally support ribs 42 and 43, is used here to store sliding glides, which are described below.

Each of the ribs 42 and 43 is composed of two parts, a radial part 48, 49 and an offset part 46, 47 The radial part runs along a radius which extends from the axis of the evaporator section and which offset portion diverges from the radius and is connected to the adjacent rib 36 or 37. As in Flg. 3 shown is, the "between the ribs 36 and 37 enclosed Angle 45 ° and that between the rib 37 and the radial Part 49 of the rib 43 included angles also 4 $ °. That the same applies to the radial part of the rib 42 and the rib 36. The angle between the radial ribs 36, 37 and the offset portion 47'46 is preferably as close as possible at 45 ° without disturbing or hindering the locking elements before, during or after the unprotected shape6.

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It has been found that an angle of 45 ° between an- ' adjacent ribs on an ambient air evaporator is preferred due to the fact that the frost development, which inevitably occurs on the rib surfaces, none Forms bridges between adjacent hips when the angle is approximately 45 °. When the one between the ribs included angle is less than about 40 °, it has been found that the 3? rust attaches to the two ribs starting at the root of the angle and then radially outward progressively bridged. The development of frost, of course, reduces the desired heat transfer characteristics of the air evaporator is essential. If the included Angle is greater than approximately 45 °, the number must on ribs and thus the surface area can be reduced *

The hub 38 includes a generally annular portion 51 "with an inner partially cylindrical surface 52 * A pair of locking links 53 and 54 jump of the annular member 51 in front of *, however, exists with this from one part «, the locking member 55 is called the short Locking member and member 54 as the long locking member in the interest of defining the invention. The short locking member 55 has partially the shape of a partially cylindrical surface 58 on «The Surface 58 preferably has an approximately 90 ° -3 arc. The outer end of the locking member 55 is rounded at 59 , .which weaken the bow somewhat; the The purpose for this action is described below. That Locking member 53 further comprises an inner part cylindrical surface 60 concentric with the cylindrical surface 58 is. The radius defining the cylindrical surface 60 is preferably one-half times that Radius defining cylindrical surface 58 ·. As in

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As shown in Figure 3, Ai had a partially cylindrical surface at 18O ° -Boeea.

The long locking member 54 is also formed by and consists of an extension of the Hab x 38 one piece. The latter locking member includes a base portion 62 which preferably extends in the opposite direction from that used by the locking device 43 specific extension extends. The base member 62 is slightly longer than the total extent of the solid Latching member 53 as shown in Pig. 3 indicated thereby is that the dimension A is larger than the comparable dimension B. The reason for this action is as follows described.

The outer portion 64 of the locking member 54 is formed at 90 degrees to the base member 62 during the extrusion process. The connection between the outer member 64 and the base member 62 is formed with rounded surfaces 65 and 65 so that the outer member 64 can be flexed inwardly toward the hub 38 without breaking the connection or otherwise suffering damage In the preferred embodiment of the invention, the outer member 64 is made slightly longer than the base member 62. The outer ends of the outer link 64 are also rounded at 67,68. It has been found that by rounding off surfaces of aluminum that is to be bent or otherwise shaped, metal damage is often avoided.

The inner cylindrical surface 52 of the hub 38 is with formed a cylindrical surface that is less than half the full cylindrical surface (less than a 180 ° bend). The reasons for such a design of the surface 52 will be examined below in connection with the arrangement of the extruded parts and the conduit pipe.

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009831/1565

By using two identical evaporator parts as shown in Figure 3 and arranging the two parts in the manner now described about a fluid conduit composed of a similar or dissimilar metal and locking the locking members of the two identical parts can form a unitary ambient air evaporator section without the requirement. Be trained to perform welds. The final product is shown in FIG. By fitting of the cylindrical surfaces 52 of the split parts with the outer cylindrical surface 70 of the line 71 and due to excessive bending of the outer members 64 of the long Verriegeiungsgliedes for the purpose of engaging with the short locking member 53 of the -ik opposing part, the two identical parts in a good Heat transfer relationship to be attached to the pipe. ·

The apparatus for performing this step is described in detail below. The bending and shaping is done actually in two-stage forming rolls in a single process. In the first stage becomes the outer limb 64 bent at a 45 ° angle with respect to the base member 62. This becomes the inner surface 72 of the outer Member 64 of a part in contact with the bent Brought surface 58 of the fixed locking member 53 of the other part. In a subsequent non-stage becomes the outer link 64, even further inward on the Base member 62 pressed to. The first poraung step is 9 and the second molding step is shown in FIG. By pushing in further of the locking member / Ln the second step this is caused to the outer curved surface 5Θ of the fixed locking member 53 adapt. That leads to

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clamps the parts together around the tube or conduit 71 and causes the cylindrical surfaces 52 to mate with the outer cylindrical surface 70 the line 71 adapt. By adapting these surfaces to each other and by making substantially complete contact between the S surfaces 52 and 70 over the length of the section, optimal heat transfer characteristics are realized.

When forming the inner, partially cylindrical surface of the hub © 28, a radius is used which is slightly the radius of the outer cylindrical surface of the Pipe or the line 71 exceeds. Venn, for example the radius of the tube is 1.59 cm (0.625 inches) then The radius of the property is approximately 1.65 cm (0.65 cm) inches). This happens for a number of reasons. Due to the nature of the extrusion process Tolerances on extruded ropes are usually larger than comparable files made by other methods (machining, etc.) manufactured bind. Therefore, the inner radius should be slightly oversized. Furthermore, it has been found that when the radius of the Hub 38 slightly exceeds the radius of the outer cylindrical surface of the tube, the hub better in the Is able to conform to the outer surface of the pipe. In the preferred embodiment of the invention the raw material is made of stainless steel, and therefore the extruded aluminum adapts to the surface of the harder stainless steel.

Thus, when the latches are pushed over one another, the cylindrical surface 52 is able to self-align closely to the outer cylindrical surface of the raw material so that the thermal contact or transition

009.31 / 1511

Resistance between the pipe material and the Nahe is minimal is done »if the radius of the bent portion 52 were smaller than the radius of the conduit (or an undersize would have), the hub 38 would not be easy or willingly adapt to the surface of the line. It is therefore advantageous to provide the hub with a slightly oversize so that the extrusion tolerances can be observed and the hub always adapts easily or willingly to the drilling material.

The curved or curved part 58 of the short locking member 53 is formed so that the outer member 64 of the adjoining evaporator part in an arc shape over the short link can be bent. Bas happens with it sharp bends in the member 64 would be reduced, which would be subject to damage · The dimension A of the Base link 62 is larger than the dimension B of the short link 53, so that the outer link 64 is rounded Exceed surface 59 and can be molded around the short link 53. The curved surface 60 of the short Link 53 is designed so that by the dimension G is equal to the thickness of the long locking member 54 indicated by the D dimension is. This is done so that the rebound forces, which are called Result of the molding process occur both in the short ale also the long lock eg lied equal to β iod. the Locking members play one in the weeent by the fact that the return forces are essentially equalized borrowed the same Bolle in the production of the tension or Clamping forces on the pipe material. Thus, the resilience forces hold when cryogenic liquid passes through the Pipe material 71 is pumped and the stainless steel pipe due to its low temperature slightly contracts the cylindrical surfaces 52 in contact with the outer surface 70 of the conduit.

009831/1566

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This inherent elasticity in the locking technique of the invention thus allows changes in tolerances and "low temperature" changes in dimensions to. The methods and apparatus for forming will be described after other embodiments have been described of the invention described in detail.

FIG. 5 shows a further embodiment of the invention, in which a pair of identical evaporator parts 80 are used, which are to be locked around a fluid-carrying line. The hub 81 of each part is formed with locking members 82, 8J extending essentially in opposite directions. Serrations or protrusions 84 are formed on a surface of each of the locking members 82 and. In the preferred embodiment, the inner cylindrical surface 85 is formed with an arc slightly shorter than 180 °. A pair of identical parts 80 are placed over conduit 86 in such a manner that locking projections 83 and 84 lie along adjacent locking B projections on the adjacent part. Thereafter, a locking clip 89 is sung over each pair of adjacent locking members and the locking clip 89 is driven substantially radially inward φ so that the locking members are clipped together. The bracket 89 is auegebild with inner Auesackun gene or projections 90, which go over the Aue serrations 84 and which are angled so that a return movement of the bracket 89 from the locking members 83 and 84 is prevented when the bracket is fully seated on them . In the in Pig. In the embodiment shown in FIG. 5, the inner radius of the hub 81 is again made slightly larger than the radius of the outer surface of the conduit 86 in order to achieve the same result as described above in connection with FIG. 4. So practice

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the brackets 89 formed by forming rollers can be pressed, an elastic clamping force on the hubs 81, so that they are the surface of the pipe material adjust. The parts 80 can be formed from extruded aluminum sections and the locking members 89 as well Consist of aluminum. .

6A shows a further embodiment of the invention shown in which the hub 90 is made in one piece and is split at 91 in a longitudinal direction. The hub 90 has an arc slightly shorter than 360 ° (by 2 ° to 5 °) on. A pair of lugs 92 and 93 are integral with the Hub and extend substantially radially away from the part that is split. A clamp device 94 can with the radially extending lugs 92 and 93 will be engaged and through this facility the hub on or around the raw material 102. the Clamping device 94- is preferably as long as the hub portion 90, so that a clamping force on the Anaätze 95 and 92 along substantially the entire length of the hub 90 is practiced. The bracket link 94 has a double T-iron configuration with projecting lugs or lugs 95 and 96, which the lugs or lugs 92 and 93 euf the hub enclose. By the arms 98 and 99 of the double T-link be pushed apart, as shown at 97, the Lugs 95 and 96 brought into contact with seats 100 and 101 to press the lugs 92 and 93 on each other, whereby the hub 90 is clamped around the tube 102. The lead 102 is pushed into the hub 90 before the clamping device is applied. The clamp device, which is preferably made of aluminum, is also in his Position. e. pushed onto the hub before clipping. As in the fall of Flg. 4 and 5 is the inner radius of the hub

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For the reasons outlined above, it is made slightly larger than the radius of the outer cylindrical surface of the line 102.

In Pig. Figure 6B shows another embodiment of the invention. The evaporator section 140 is made of a single one Extruded profile produced, the hub 141 being split in the longitudinal direction at 142. In this embodiment, the clamping force exerted on the reveal 143 by the hub 141 itself. The split part of the hub is pushed open slightly to enable the insertion of the lead 145. When the line is fully inserted, the hub can be turned around line 143 close. Parts 146 and 147 form locking members that wrap around the conduit. They inherent springback characteristics of having keep them old Line locked. In this embodiment, the ionic radius of the hub 141 is slightly or less wide than that of sliding smaller than the radius of the outer surface of the pipe. Due to the hardness of the line made of stainless steel, it fits the softer aluminum inner surface of the hub willingly the line to achieve good heat transfer.

In Fig. 7 a gate direction for forming the ambient air evaporator, which was described in connection with flg. 4, is shown. The device has the form of a suitable support or bearing frame "103" on which a drive mechanism 104 and a large number of bearing arrangements "are mounted, which rotatably support four shafts 105 to 106. Shafts 107 and 108 are located directly below shafts 105 and 106. All shafts are drive-connected to a drive device within drive housing B 104. The housing contains a motor which, with a suitable gearbox etc., rotates the upper shafts 105 and 106 in the same direction and with the same gear.

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speed is connected. The drive mechanism drives the lower shafts 107 and 108 at the same speed and in the same direction, but in a direction opposite to that of the upper drive shafts 105 and 106. Guide plates 109 and 110 are fastened in the vertical direction to the supporting frame 103 and are arranged in such a way that the evaporator parts and the associated tubular line are fed into the forming rollers or forming rollers 120 and 121. Two pairs of shaping rolls are used, each of which has an upper and a lower Formungsrols iOrmungsrolle asc £ st _f as shown in Fig. 8. Each of the forming rollers is made up of a multitude of interlocked wheel-like members *? composed with changing radius and changing configuration.

When assembling the ambient air evaporator shown in FIG the identical parts will do that. middle one Conduit and the locking members are placed in a substantially vertical position You arrangement is then on the guide plate 109 la one placed such that one of the outer members 64 rests on the surface of the guide plate 109 - Si · arrangement is then slid along the plate 109 and between that Forming rollers 120 and 122 out. The locking members then come into engagement with the forming rollers 125 and 126, as shown in FIG. The radial tip parts of the evaporator fins can roll into engagement with parts of the ForaungB 127 to 130 as shown at 150-157 * By touch the tips of the evaporator fins with the forming rollers in the way shown are the evaporator parts on their Held in place while the main forming rollers 125 and 126 the outer member 64 around the fixed locking member 53 shapes. The first set of forming rollers encountered bends the outer member 64 by 45 ° and in contact with the

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curved surface of the fixed locking member. Of the next set of forming rollers the evaporator section is right behind the one in Pig. 8. specified forming rollers arranged. This set of forming rollers completes the flexing of the outer members 64 so that they fully conform to the curved surface are adapted on the fixed locking member. The shape of the ones used to complete this process Forming rollers are shown in FIG. They have a channel-shaped recess 144, which the outer member 64 bends further inward. Bearing moving rollers (158-161) Similar to the pods shown in Figure 8 (127-130) are attached to the second set of forming rollers for storage the radial tips of the ribs.

When the evaporator technology rolls the «wide set of yormung leaves and slides on the guide plate 110, he can decide whether the molding is complete has been or not and whether the identical parts are made of extended (extruded) surface material whether or not they are fully attached to the conduit in the desired manner. The drive mechanism 104 is therefore designed to be reversible, see above. that desired If necessary, return the sections of the evaporator and can be passed through the tube device. the α details of the drive mechanism and the storage structure door, which is the transmission for the roller forming device have not been described in detail, since they are of a known nature.

A roll forming apparatus similar to that shown in Figs. 7-10 can be used which is illustrated in Figs Figs. 5 and 6A to assemble.

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That is, forming rollers press the clamping devices 89 via the lugs 85, 84 ·, which dee. Extend the evaporator. In the embodiment in Fig. 6A A roller can be used to push the Americans and 99 apart.

In Fig. 11 is a further embodiment of the invention shown. Identical parts 160 and 161 are made from tightly pressed aluminum and around a tubular® conduit 162 in parentheses. Each part is made from a single component and two locking links, one partially © »ylindri-. ■ ν see recess 164 and a snap lock 165 »built up. The snapper is from an extension of the property formed and has a stabfönaigea ELeaeai 166, daa snaps into the recess 164 · You wipe the Element 166 and the hub has sufficient flexibility as well Elasticity so that the element snap into the recess can and thus the two parts 160 and 161 over the Line 162 can be placed and snap into place. The inner radius of the hub 163 is made up of the same Reasons as stated above in connection with Figs. Fl-, 5 and 6A, slightly larger than that of line 162. Thus, the parts 160 and 161 are elastic, for example. springy coupled with the line. Forming rollers can be used be to the snap coupling of the execution form ia Fig. bring about. By SueasmenSrück the part «,« la through the arrows indicated «can the i & anappverbi & dusag" fe @ s? b «i® · - to be led "

When the evaporator sections have been assembled, As described above, they can be mounted in a questionnaire so that they can be transported and sent to a · consumer station can be mounted. Since Leltu & gemat®- rial made of stainless steel is used and

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weiae · a steel framework is used, the supporting structure to form, the line material can be made of stainless steel by means of brackets or struts on the supporting structure of the Framework to be attached. In the shown embodiments, the elongated rib surface made of aluminum expands and pulls itself at will without the structural one Impact structure between the drilling material and the supporting structure asu. In all embodiments, the Aluminum rib structure radially or axially as desired expand or contract, but it always conforms to the outer surface of the stainless tubing Steel on.

The entire surface is advantageously unified each of the aluminum parts with a thin layer 0.02-2.5 ιβ; (· 001-100 ") of a material based on fluorocarbon, such as materials with the trade names Teflon, Coracone, Dynar, ^etc · coated. This coating provides a good appearance, significantly reduces the frost formation that normally occurs, and has been found to only marginally reduce the expected heat transfer rate of the evaporator. The coating can also be applied to the inner cylindrical surface of the housing in that when the layer is so thin that there is only a temperature drop of 1 or 2 ° above this layer. The layer of material made of fluorine-carbon is mechanically resistant, or permanent, resistant to low temperatures and to most Chemicals and solvents (solvents) and, as mentioned above, greatly reduces the formation of freezing, which in this type of a Unit occurs.

The invention is not limited to ambient air vaporizers, it can be used in the manufacture of any

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any other device or structure that ^{requires a 1} SeH to be attached to the outside of another part. Thus the invention can find application in the manufacture of many types of heat exchangers. she
can be applied v / ground, an insulation or decorative
Attaching material to pipe material or lines,

- patent claims -

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Claims (1)

Claims M.) Ribbed arrangement, characterized by a hub part with an inner curved or arched Surface, a plurality of ribs extending outwardly from the hub and a pair of locking members, which are connected to the hub and can lock the assembly to another part. 2. Arrangement according to claim 1, characterized marked ennzeichn e t that the other part is an elongated tube. 3. Arrangement according to claim 1, characterized geke η η ζ calibrate W net that at least one of the ribs extends radially from the hub. 4 ·. "Arrangement according to claim 3» characterized thereby e t that another rib protrudes from the at least one radial rib along its length. 5. Arrangement according to claim 1, characterized in that that at least two ribs extend radially and enclose an angle of approximately 45 °. 6. Arrangement according to claim i, characterized in that it is marked-A . net that the locking members in substantially extending in opposite directions from the hub and that one of the locking members is longer than the other Locking member is. 7. Arrangement according to claim 6, characterized in that that the longer locking member has a part which extends at right angles to the other part. 009811 / 1Mf BADOR ₁ QiNAL - 8. Anadnung according to claim 1, characterized in that each locking member has a toothed part having. , ·. 9. An arrangement according to claim 1, characterized g β k s η% β 1 ch -NET that the locking members extend substantially radially, each of said members to increase having. ■. 10. An arrangement according to claim 1, characterized ge Il e η η χ ei ch et -η that one of the locking? Members one flexible projection and the other locking member has a set-back or recessed portion · 11. The arrangement according to claim 1, characterized in that the property for forming the locking members is split .. 12. The arrangement according to claim 11, characterized in that the locking members are biased against each other and are suitable for the other part of the property to clamp elastically 13. Apparatus for clamping elongated surface material comprising at least a portion of a tubular member to form an assembly, marked net through a shoring, a pair of foniunfsrollea biw. Shaping rollers which are rotatably attached to the supporting frame, a device for driving the rollers in opposite beds Directions and a support means for guiding the at least one part and the limb between the forming rollers, each of the hells comprising shaping girdles for clamping the at least one part around the limb BAD ORiGtNAL 009831/1583 14. The device according to claim 131, characterized in that it comprises a second pair of Forraungsrolle which are attached to the supporting frame wherein the second lobes are forming means for further clamping of the at least one part to embrace the limb. 15. Apparatus according to claim 13 or 14, characterized in that it is a reversing drive device for reversing the direction of the Includes forming rollers. 16. The apparatus of claim 13> characterized in that each of the forming rollers comprises a plurality of wheel-like members of different diameters which are part of the contact of a plurality of points of the at least one Partly for the storage of the parts with the Joraungepro-ζβθ. Apparatus according to claim 13, characterized in that each of the forming rollers comprises a wheel-like member having a circumferential separation suitable for engaging and clamping the part via the member SU. 18. Procedure to declare feet a pair ·· of identical ribbed arrangements on a tubular member, characterized in that the arrangements on da tubular member that simultaneously a movable member on each of the assemblies via a fixed The link on the other of the assemblies is bent so that the assemblies are locked into place on the link. BATH ORIGINAL 009831/150 * 19. The method according to claim 18 ^ thereby g β k β η η— let c h η e t that the movable link goes even further is bent over the fixed link in a second bending step. 20. Ambient air evaporator, labeled through a stainless steel pipe and a pair of extruded aluminum rib assemblies that at least partially surrounding the conduit, each of the assemblies a lifting section, at least one has rib mounted on the hat and a locking member that engages with part of the other assembly engages to keep the assemblies locked around the line. ν 21. Evaporator according to claim 20, characterized in that g «k e'η η ζ ei c h η et that the pair of ribsaaoMmmgea. is identical. 22. Evaporator according to claim 20, characterized in that that the hub portion has a pair of locking members, one of which longer than the other. 25. Evaporator according to claim 22, characterized in that that the longer · an arrangement over the shorter the other arrangement is curved " 24. Heat exchangers, characterized by a pair of identical fin arrangements, a lei device and devices for locking the arrangements around the line. * 25. Heat exchanger according to claim 24, characterized in that the locking device has a Has snap connection on each rib assembly. 26. Heat exchanger according to claim 24, characterized in that the locking device is a Pair of U-shaped brackets. 27- heat exchanger according to claim 24, characterized in that that the locking device comprises bendable tabs or protrusions on each assembly. 28. Warms up rather, marked by a Hip arrangement with an itabe part, from which the ribs are made extend, with the property split in the longitudinal direction ao is that it has an elastic connection with a drill which extends through the property » 29 · Heat exchanger according to claim 28, characterized by a clamping device to lock the split hub around the conduit. 30. Heat exchanger according to claim 28, characterized in that the split Hab is preformed in order to exert an elastic hema force on the line. 31. Heat exchanger according to claim 24 or 26, characterized in that the lip arrangements are coated old with a layer of a material based on fluorocarbon which has a thickness of approximately 0.02-2.55 mm (.001 to .100 ") . BATH ORIGINAL 009831/1685 to Blank page